DS3172N Maxim Integrated, DS3172N Datasheet - Page 80
![no-image](/images/no-image-200.jpg)
DS3172N
Manufacturer Part Number
DS3172N
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172N
Part # Aliases
90-31720-N00
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Figure 10-14. DS3 Frame Format
The subframe framer continually searches four adjacent bit positions for a subframe boundary. A subframe
alignment bit (F-bit) checker checks each bit position. All four bit positions must fail before any other bit positions
are checked for a subframe boundary. There are 170 possible bit positions that must be checked, and four
positions are checked simultaneously. Therefore up to 43 checks may be needed to identify the subframe
boundary. The subframe framer enables the multiframe frame once it has identified a subframe boundary. Refer to
Figure 10-15
Figure 10-15. DS3 Subframe Framer State Diagram
M
M
M
X
X
P
P
1
2
1
2
1
2
3
Verify
F
F
F
F
F
F
F
for the subframe framer state diagram.
11
21
31
41
51
61
71
C
C
C
C
C
C
C
11
21
31
41
51
61
71
All 4 bit positions failed
2 F-bits loaded
Sync
F
F
F
F
F
F
F
12
22
32
42
52
62
72
680 Bits
C
C
C
C
C
C
C
12
22
32
42
52
62
72
Load
80
F
F
F
F
F
F
F
13
23
33
43
53
63
73
C
C
C
C
C
C
C
13
23
33
43
53
63
73
F
F
F
F
F
F
F
14
24
34
44
54
64
74
7 Sub-
Frames
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